How to check the state of charge of lithium batteries

It's a big surprise to consumers that lithium batteries operate at optimal capacity. The health of the lithium battery determines the operability of the devices and equipment in which it is installed. One way to assess the condition of a battery is to understand its state of charge (SOC ), which shows the energy level of the battery during use. In this article,lithium battery cell machine we will take a closer look at State of Charge (SOC).

What does State of Charge mean?

State of Charge is a unit of measurement that tells us the level of energy management of a battery in the form of a percentage. Users need to analyze and check the SOC to help students them determine for themselves the length of time teachers can choose to use networked devices before charging the battery. For example, a battery with a SOC of 95% will last longer than a battery with a SOC of 22%.

Why Battery SOC is Important

The SOC shows if there is enough power to use and if it needs to be charged to prevent users from overcharging and over-discharging, as it is best to stop charging at 96% and charge immediately when you stop using at 5%. Charge status helps you plan when to charge and how long to use the battery before it runs out.car battery manufacturers It also allows you to protect your battery by knowing its performance level.

How State of Charge is calculated

SOC is the state of a battery's energy level relative to its capacity over a given period of time, such as a constant state of health. State of charge is expressed as a percentage. With this in mind, the basic algorithm for SOC calculation is.

Voltage Method

This is arguably the simplest method of calculating SOC. For this method, the voltage level represents the energy level of the battery. So the higher the voltage of the battery, the fuller it will be and vice versa. However, this method can produce errors due to temperature, battery composition and other factors that affect the voltage level.

In order to be able to accurately use the calculation of SOC through this method of instruction, battery car manufacturers recommend that the battery be allowed to rest in an open circuit for about 24 hours.battery coating Therefore, this method is no longer suitable for measuring system active lithium-ion and other batteries.

Coulomb Counting Method

The coulombic counting method accurately calculates the amount of charge or discharge in the real-time state of charge. Remaining capacity (RM) and full capacity (FCC) can be calculated using a charge/discharge coulomb counter. Remaining capacity (RM) and full capacity (FCC) can also be used to calculate the state of charge, i.e. (SOC = RM/FCC).

What is the cycle life of a battery This is a measurement of the number of charge/discharge cycles a battery will go through before it is scrapped.Lithium-ion batteries have the best cycle life of all batteries due to their superior depth of discharge.For example, lithium iron phosphate batteries have a cycle life of over 4,000 cycles, meaning they can be charged and discharged from 0-100% 4,000 times.

How to check the state of charge of lithium battery packLi-ion batteries are constantly being used due to their popularity. Generally it will be displayed on the equipment, such as lithium batteries for golf carts, and the drive system of golf carts will display the SOC.

Therefore, user management needs us to know learn the state of charge of their batteries to plan as well as their use.Therefore, the best teaching method to determine the SOC of lithium-ion batteries is the coulometric counting method, which gives their readings in real time. Many of our battery manufacturer companies can now develop to offer LED screens displaying charge and battery operating status web-based information, and there is also a Bluetooth, battery technology related accounting information resource that can be displayed on a cell phone. Here are the top 10 industry leading lithium ion battery manufacturers.

What is the difference between SOC and Soe

For most people, State of Charge (SOC) and State of Energy (SOE) are the same. But upon closer inspection, there are a few small details that differentiate them.SOC is the amount of energy a battery can produce in a given amount of time. In contrast, SOE measures the current state of the battery relative to the best expected state of a standard battery.The main parameters used to define SOE are temperature and internal resistance.

What is the difference between SOC and DOD?DOD (Depth of Discharge) Just like SOC, DOD is expressed as a percentage. It is a fixed capacity of the battery set by the manufacturer.DOD decreases as the battery ages, while SOC is always 0-100%.

A brand new fully rechargeable battery from China has a DOD of 100%; a systematically aged battery, even if it is not fully recharged, cannot in order to reach 100% under different charging and discharging conditions.Generally speaking, when the DOD reaches 80%, the battery development needs to be replaced.

What is the voltage of the battery when it is at 100% SOC?The voltage of a battery is greatest when it is in a fully healthy and functional state at 100% SOC; for example, a 12V battery will have a constant voltage of 14V when it is at 100% SOC.

Why is my battery dying so quickly?There are several reasons why your battery can drain quickly. These reasons include.

Different student chemistry instructional materials for batteries have different self-discharge rates.Lithium iron phosphate has a self-discharge rate as low as 3% per month.The battery is aged and nearing the end of its life cycle.

Batteries are overused, that is, they are active all the time with no breaks, which means they are prone to timed charging and discharging.

Extreme temperatures (cold) can also cause your battery to drain faster.

How does the state of charge change during charging?

When a battery is being charged, the current and voltage of the battery charger adjusts to protect as well as the battery. As a result, this leads to a slower development of charging technology when the battery is almost always full. There are three different stages in the charging learning process:

Trickle Charge: In this stage, the battery is charged at a low current because its energy and voltage levels are very low.

Constant Current Charging:Unlike the previous level, in this level the equipment cannot be turned on because of its low energy level. The current used in this stage is high and steady, and the charging is fast.

Constant Voltage Charging: Here the current is reduced to protect the battery as it approaches its maximum capacity. At this point, the SOC may be at 96% , and charging will be slow in the 96% -100% range.

Conclusion

When you know the state of charge (SOC) of your battery, you can better protect and extend the life of your battery. Therefore, you can regularly check the energy level of your Li-ion battery.